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BJP4 Self-Check 8.4: ReferenceMystery3

Language/Type: Java Objects Point reference semantics
Author: Marty Stepp (on 2016/09/08)

The following program produces 4 lines of output. Write each line of output below as it would appear on the console. 

public class ReferenceMystery3 {
    public static void main(String[] args) {
        int a = 7;
        int b = 9;
        Point p1 = new Point(2, 2);
        Point p2 = new Point(2, 2);
        addToXTwice(a, p1);
        System.out.println(a + " " + b + " " + p1.x + " " + p2.x);
        addToXTwice(b, p2);
        System.out.println(a + " " + b + " " + p1.x + " " + p2.x);
    }

    public static void addToXTwice(int a, Point p1) {
        a = a + a;
        p1.x = a;
        System.out.println(a + " " + p1.x);
    }
}
line 1
line 2
line 3
line 4

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